As you look around, Lefty, you don't find any doors, but you do spot several things that emanate magical auras, mostly among the remains: a chain shirt, a rapier, a belt, a circle of black cloth, a couple rings, and what appears to be a now-frozen potion. As you give the remains a closer look, you also find 4,700 gp in assorted coinage and gems.

Ever the optimist, Raulzig looks a bit disappointed.
"The cunning fiend disappeared just as we were about to serve it its fire-breathing backside on an ice-filled plate. Harumph. I guess I'll have to be less threatening going forward."

He takes interest in the ogre statue, the falchion on the floor and the spot on the north wall it seemed to point to.
Perception:1d20 + 34 ⇒ (9) + 34 = 43

You believe the items are a +1 improved shadow chain shirt, a +2 rapier, a belt of dwarvenkind, a portable hole, a ring of counterspells (currently empty), a ring of invisibility, and a frozen potion of cure serious wounds.

The statue looks like it was once alive, but then turned to stone. There doesn't seem to be anything on the north wall that it's pointing toward.

Krokod eyes the material, seeing nothing in particular that he wants per se, "I leave it to others to stake their claim. Frankly that 'hole' looks like the sort of thing my old village would have stoned someone for."

Walking down a 20-foot-long passage, you come to bars of ice blocking the way forward. On the other side of the bars, you can see a large, round room, its domed ceiling rising 30 feet overhead. Bars also block alcoves flanking a door to the north, as well as a passages to the east.

An elaborate ice throne sits within a raised alcove to the south, surveying the chamber. Heavy manacles are inset into the throne’s arms, back, and legs. Several more sets of manacles are spaced about the chamber’s walls, interspersed with various diabolical instruments of torture. A fifteen-foot-diameter cage of ice bars that extend from floor to ceiling dominates the center of the room. Floating within this cage is a huge sphere of crackling, gray energy.

1d20 + 19 ⇒ (20) + 19 = 39Ouch

Perception 39:

You can see shadows that make you think some sort of humanoid is in the room as well, though not in plain sight. There appear to be seven of them.

Raulzig sneaks into the room after Lefty.
Stealth: Take 10 = 40Perception: Take 10 = 44
And immediately retreats to where the rest of the party is.
"Aside from this Undeath sphere, there are seven humanoid creatures waiting in shadows. Looks like an ambush. I suggest we prepare ourselves."If there is time available before the encounter, Raulzig will cast another Haste and Tactical Acumen on party, and Shocking Image on himself, before re-entering the room.

Ryarg, how are you casting firestorm? From what I can see it's just an oracle ability. That damage isn't factored in yet, since I'm not sure where it's coming from. Once I get that info, I'll adjudicate their actions, so you can all go in a row and react to whatever they do.

There's a burst of energy in the room that seems to have no effect on you, but suddenly two horrific humanoids move into the entrance to the room. They gesture, and bursts of cold suddenly reach toward you. 35 and 36 cold damage to all; DC 18 Reflex for half damage

Ref1:1d20 + 21 ⇒ (11) + 21 = 32Ref2:1d20 + 21 ⇒ (8) + 21 = 29
The blasts of cold travel too slow for the hasted gnome, and he easily evades both of them.
Do I have to spend a move action getting into the room, or do we assume it happened in the surprise round?

You'll have to spend a move action -- the two figures blocking the way will be incinerated, however, by Lefty's spell, so it will just be the elemental. The hallway's 20 feet wide, Ryarg, so probably no room for Bern unless you move fully into the room first.

Lefty's bolt of fire rips into the elemental before bouncing back toward the two figures, who scream once as they're incinerated.

Rualzig's bolt hits the elemental, which seems to consume it as the energy flares momentarily there 13 hp damage It's followed immediately by Krokod and Ryarg rushing forward, their attacks ripping into the ball of energy. As they hit it one last time, it suddenly explodes in a burst of energy that painfully washes over the five of you. 27 hp negative energy damage; DC 22 Reflex for half

For when you're done getting yourself healed, some of this is reposted description from before the combat:

You enter the large, round room at the end of the 20 foot passage, its domed ceiling rising 30 feet overhead. Bars still block alcoves flanking a door to the north, as well as a passage to the east.

An elaborate ice throne sits within a raised alcove to the south, surveying the chamber. Heavy manacles are inset into the throne’s arms, back, and legs. Several more sets of manacles are spaced about the chamber’s walls, interspersed with various diabolical instruments of torture.

You see seven humanoid figures, which are crumbling into dust, though each leaves behind a breastplate that radiates magic to Lefty's eyes.

Reflex:1d20 + 21 ⇒ (6) + 21 = 27
His reflexes honed by years of successfully escaping death traps in the tombs of Katapesh, Raulzig slips behind cover at exactly the right moment for the negative energy wave to coast past him harmlessly.

"Speaking of the happy sticks, I have some too!" He offers a fresh CLW wand to Lefty to replace the used one.

Much resources burnt on this one since I assumed the seven humanoid figures will be hostile... well played, DM!

Spellcraft on the breastplates: Take 10=32Spellcraft on the Throne: Take 10=32Bardic Knowledge on the Throne:1d20 + 14 ⇒ (1) + 14 = 15

"Was that the seat of Koststchie? I would refrain from trying to sit on it, if anyone has this kind of ideas."